Strict typing, composition and QA

Added

• Added psalm as QA tool
• Added phive to install QA tools
• Added \de\codenamephp\platform\di\iContainerBuilder interface

Changed

• Switched from Jenkins (which wasn't operational in a few years) to travis
• Updated PHPComp
• Added strict type declaration to all files
• Added type hints and return type hints to all methods
• ContainerBuilder was changed from inheritance to composition
• Made classes final